Photo Assignment: Desktop Background

Ok guys, here is your task. What are your best desktop background photos? I'm looking for stuff that anyone who loves mountain biking can enjoy. It should be somewhat vague but also convey the spirit of mountain biking. I'm thinking nature, a gnarly section of singletrack, artistic riding shots. Here are my current ones. (iPhone 3GS)

So, let's fill up our work days in the office with some good art of what we would rather be doing!

This one is not an action shot or anything, but I just love it. Often set it as my background:
Here's the link, if someone wants a larger version:What a sky | Flickr - Photo Sharing!

And this one is my favorite summertime background - since it shows one of the best places to ride, and helps me forget the heat
Link again, in case anyone wants a larger version: Sedona Snow | Flickr - Photo Sharing!